[Merged by Bors] - chore(*): remove some defeq abuse of ^
#18136
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There are various places where the proofs relied on the defeq of
^
, namely thatrfl : x ^ 0 = 1
rfl : x ^ (n : ℕ) = x ^ (↑n : ℤ)
rfl : x ^ (n.succ : ℕ) = x * x ^ n
While exploiting defeq is not always a bad thing, in some of these cases it was clear that this wasn't intentional, and the author had not noticed that they were working with integer instead of natural powers.
This change is motivated by two possible refactors:
monoid.npow_rec
to matchfunction.iterate
real.has_pow
to be the elementwise power on the cauchy sequence (refactor(data/real/basic): golf the ring instance #8146)